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SCENARIO
A Six Sigma team is measuring the moisture content of corn starch as it leaves the conveyer belt of a dryer. They collect one sample four cups of starch at times indicated in the chart at fixed locations labeled A, B, C, and D across the end of the belt. See the diagram below.
Find the equation of the regression line for these sample data points:
(1, 7) (3, 3) ( 3, 2) (5, --1)
Suggested Answer: D
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24 comments · newest first
EL
Elly
2 days ago
I think A looks good.
TA
Tabetha
7 days ago
This question is tricky.
LA
Latrice
12 days ago
Let’s hope we get it right!
AL
Alline
17 days ago
I feel like A is the best fit overall.
TE
Terrilyn
23 days ago
D seems too flat for this scenario.
ST
Stanton
28 days ago
I’m stuck between A and D.
CO
Cora
1 month ago
True, but it fits the trend.
LA
Latrice
1 month ago
But C starts too high, doesn’t it?
AL
Alline
1 month ago
C has a strong negative slope too.
CO
Cora
2 months ago
I’m leaning towards C.
PA
Pansy
2 months ago
The slope seems reasonable for decreasing moisture.
TE
Terrilyn
2 months ago
Why A?
PA
Pansy
2 months ago
I think option A looks good.
LA
Latrice
2 months ago
I agree, the data points are confusing.
ST
Stanton
2 months ago
This question is tricky.
VI
Vivienne
3 months ago
Is there a reason for the duplicate x-value at 3?
LE
Leota
3 months ago
Totally with you, Carin! A seems to fit best.
LO
Louann
3 months ago
Wait, how can moisture content be negative?
CA
Carin
3 months ago
I think option A looks right!
GE
German
3 months ago
The points are (1, 7), (3, 3), (3, 2), (5, -1).
AD
Adelina
4 months ago
I feel like I need to double-check my calculations for the slope and intercept. I hope I remember the right steps from our last review session!
ER
Erin
5 months ago
This reminds me of a similar question we did in class where we had to find the best fit line. I think I might lean towards option A, but I'm not completely confident.
NO
Nobuko
5 months ago
I think the equation should be in the form y = mx + b, but I can't recall how to calculate the slope correctly for these points.
CH
Cheryll
5 months ago
I remember we practiced finding regression lines, but I'm not sure how to handle the negative value in the data set.